Caliper type spot brake



May 26, 1964 Filed Oct. 20, 1960 R. T. BURNETT ETAL CALIPER TYPE SPOT BRAKE 7 Sheet-Sheet 1 RIC/MRO raumvzrr Jana: J Pan L46 INVENTORJ A T TORNE Y y 26, 1954 R. T. BURNETT ETAL 3,134,459

CALIPER TYPE SPOT BRAKE Filed Oct. 20, 1960 7 s t s t 2 fig 2 RIC/MRO 7r BURNETT Jnmss J Pow/.4:

INV EN TORxS A T TORNE Y y 26, 1954 R. T. BURNETT ETAL 3, 59

CALIPER' TYPE SPOT BRAKE Filed Oct. 20, 1960 7 Sheets-Sheet 5 59 76 H 6/ 6286 52 II II 9 30 5 /3Z F J 3 54 nz- 2" //0 0- 56' Exam 7.- BURNETT Jam's J. Powm INVENTORS Hg 4 W 4%.

AT TORNE Y 26, 1964 R. T. BURNETT ETAL 3,134,459

' CALIPER TYPE SPOT BRAKE Filed Oct. 20, 1960 7 Sheets-Sheet 5 INV EN TORJ A TTORNEY y 26, 1964 R. T. BURNETT ETAL 3,

CALIPER TYPE SPOT BRAKE Filed Oct. 20, 1960 '7 Sheets-Sheet 6 w W l a m:ai A 6 L 6 L90 6 A6? /9/ 59 RICHARD TBURNETT JAMEJ J. Pan/Ms INVENTORS ATTORNEY y 26, 1964 R. T. BURNETT ETAL 3, 59

CALIPER TYPE SPOT BRAKE Filed Oct. 20, 1960 7 Sheets-Sheet 7 W E HQ) Wig I l I RIC/MRO 7730mm"?- /56 JAMEs J. POM/M6 2 INVENTORS AT TOR/V5 Y United States Patent 3,134,459 CALIPER TYPE SPOT BRAKE Richard T. Burnett and James J. Powlas, South Bend, Ind., assiguors to The Bendix (Zorporation, South Bend, Ind, a corporation of Delaware Filed Oct. 20, 1969, Ser. No. 63,894 13 Claims. (Cl. 188-73) This invention relates to a brake and more particularly to a disc brake which is particularly adapted to meet the braking requirements of road vehicles.

Disc brakes offer an advantage over shoe type brakes in being more controllable and more fade resistant and for that reason are becoming more in demand in the automotive field as limitations of the shoe type brake are being approached.

One of the objects of the present invention is to make further improvements in the structure shown in application 680,782 (filed August 28, 1957), now Patent No. 3,035,644, by providing, in a disc brake, a mounting structure which is free floating in an axial sense and is free to move pivotally to permit the friction members to conform with the opposing rotor surface and thereby achieve uniformity in wear of the friction members.

The anchoring load from engagement of the friction members is sustained at a location coplanar with the rotor and the supporting structure for the friction members is angularly movable on the anchoring surfaces with the result that braking forces during a brake application will not cause one or the other of the friction members to be biased against the rotor surfaces to cause them to wear unevenly. The foregoing is achieved by means of floatable support structure for the friction members which is free to adjust itself at all times in a plane normal to the plane of the rotor so that angular deflections of the rotor due to cornering forces and jounce forces will not cause pedal loss or produce unevenness of wear of the friction members.

It is a further object of the invention, to efiect an even further simplification of the brake structure shown in application No. 680,782, now Patent Number 3,035,- 664, to obtain even greater economy of manufacture and servicing of the brake.

Another object of the invention is to provide an improved parking brake comprising a mechanical actuator by which the friction members can be effectively applied, the same friction members being utilized during service braking as well as parking braking.

Other objects and features of the invention will become apparent from a consideration of the following description which proceeds with reference to the accompanying drawings, wherein:

FIGURE 1 is a side elevation view of the outboard side of the brake as it is installed on the left front wheel of an automobile, the brake rotor being shown in fragmentary view;

FIGURE 2 indicates the inboard side of the brake which is the opposite side of the structure shown in FIGURE 1 and illustrating the mounting for the brake;

FIGURE 3 is a section View taken on the line 33 of FIGURE 2;

FIGURE 4 is an end view of the brake looking in the direction of the arrows 4-4 in FIGURE 1;

FIGURE 5 illustrates a partial view of the brake looking in the direction of the arrows 55 in FIGURE 4 and illustrating the mounting and yoke members;

FIGURE 6 is a perspective exploded View of the brake with the rotor removed;

FIGURE 7 is a perspective view of an assembled brake shown after the parts are joined in FIGURE 6;

FIGURE 8 is a side elevation view of the brake as it is adapted for the rear wheel brakes and including the 3,134,459 Patented May 26, 1964 parking brake construction, the view being taken at the inboard side of the left rear wheel;

FIGURE 9 is a section view taken on the line 9-9 of FIGURE 8;

FIGURE 10 is an end View of the brake looking in the direction of the arrows 1910 in FIGURE 9;

FIGURE 11 is an enlarged detail View of the mounting for the brake actuator looking in the direction of the arrows 11-11 of FIGURE 10; and

FIGURE 12 is a fragmentary sectional view of the locking means used in connection with the adjuster for the mechanical actuator.

Referring now to the embodiment shown in FIGURES 17 a rotor 20 is mounted for rotation on a rotatable part of the vehicle such as an axle flange (not shown) and in cludes oppositely facing braking surfaces 22 and 24. A nonrotatable braking structure, designated generally by reference numeral 26 efiects retarding force on rotation of the rotor 20 to stop the vehicle. The nonrotatable braking structure 26 is mounted on a combination mounting and torque resisting member 28 having a radially inner portion 30 with openings 32 adapted for mounting the torque resisting member 28 against rotation. Torque resisting member 28 extends alongside braking surface 22 of the rotor, is spaced therefrom, and terminates in a transverse fiange 34 which is disposed beyond the outer periphery of the rotor and may include ribs 36 or the like to rigidify the flange 34. The torque resisting member 28 has lugs 38 and 40 (FIGURES 3, 4 and 5) which are constructed integrally with the torque resisting member 28 and are disposed in one plane of the torque taking member and another set of lugs 42 and 44 which are disposed beyond the outer periphery of the rotor and are in a plane transverse to the plane of lugs 38 and 40. Lugs 38, 40, 42 and 44 provide a supporting structure for the structure brake 26 which is free to move angularly in a plane normal to the planes of rotor surfaces 22 and 24 to align itself with the braking surfaces 22 and 24. The transverse flange 34 also provides convexly curved anchoring surfaces 46 and 48 upon which the nonrotatable brake structure is free to move angularly in order to conform with the opposite braking surfaces 22 and 24 of the rotor. The nonrotatable portion of the brake which is supported on the torque resisting member 28 is, in effect, a cage which is made up of two stirrups or yoke members 50, 52 having legs which encompass the rotor and are spaced sufficiently apart to permit rotation of the rotor 20 therebetween. A friction pad 54 which is clamped to two of the legs of the yoke members 50, 52 at one side of the rotor 20 makes up a third side of the cage, and a housing 56 is clamped by bolts 59 to the legs of the yoke members at the other side of the rotor and makes up the fourth side of the cage which thus extends over a sector of the rotor 26 and is supported for both axial and angular movement relatively to the rotor. Friction pad 60, which is not part of the cage, is slidably supported at its opposite ends on the yoke members 50 and 52 which form two of the sides of the cage.

The rigid four sided cage structure, although free to move axially (normally to the plane of the braking surfaces 22 and 24) and angularly on the anchoring surfaces 46 and 48, is constrained against moving circumferentially with the rotor because of the abutment of yoke members 50, 52 on anchoring surfaces 46, 48 on member 28 while the slots 62 and 64 in yoke members 59 and 52 which receive lugs 38 and 40 and the slots 66 and 68 which receive lugs 42 and 44 are proportioned to permit axial sliding movement of the cage (FIGURE 4) toward and away from the rotor surfaces 22 and 24, and pivotal motion in a plane normal to the rotor. Circumferential movement of the cage is prevented by engagement of the yoke members 50, 52 with anchoring surfaces 46 and 48.

' members 50, 52 (FIGURE 3).

The friction pad 54 at side 24 of the rotor consists of a backing 70 with turned back iianges 72 and 74having bolt connections 76 and 78 with yoke members 59 and 52 and lugs 34?, 81 which project through slots in the yokes t) and 52 to prevent turning of the friction pad 54 about its bolt mountings 76 and 73 and to transfer applying forces from yoke members 5 9 and 52 directly to friction pad 54. V

' The other friction pad 6% has a backing 2 with end flanges 84 and 86 slidably mounted in slots 62 and 64 of the yoke members and turned back flanges 33 and 90 which anchor against the inner surfaces of the yoke Both friction pads 54 and 60 are suitably faced with friction material 91 and 22 which engages the opposing surfaces 22 and 24 of the rotor.

The brake is actuated by a'piston 94 which is slidably received in cylinder bore 9a of the housing 56, both the housing and the piston extending through an opening 93 in the torque resisting structure 28. It will be noted thatthe piston is guided closely adjacent its surface of engagement 1% with the friction pad 69 to prevent cocking of the piston within cylinder bore 96. The interior of the. fiuid motor is sealed by the usual flexible boot 1%2 connected with both the .piston 94 and housing 56 I to prevent entry of dirt and other contaminants.

The housing 56 has in its interior, a combination adjuster and retracting means 194 which is intended to provide a clearance with respect to the rotor of the friction members 54 and 6t) andat the same time permit recoil and restoring movement of the friction members away from and toward their normal released position to compensate for movement of the rotor to the right in FIG: URE 3. Mechanism 194 comprises a stem 11% having a threaded end 1 12 which is received within the threaded opening 114 of the housing 56 and has a slotted end 113 which enables turning of the stem 11% and provides a shoulder 12% against which sleeve 122 is thrust by a preloader spring 124 compressed against flange 126 of the sleeve 122 and the closed end of cylinder bore 9s. A soft iron ring 130 which is about twenty thousandths oversize in relation to the opening 132 is forced Within the opening132 and relative movement is resisted between the soft ring 136 and the piston 94, it taking approximately 5 0 pounds force to produce relative movement therebetween. The overs ze relation of the ring 130 insures that it will be compressed beyond its elastic limit when squeezed within the opening 132 and the re- 7 sulting'normal force between the ring 130 and opening 132 is substantially the same regardless of the amount of deformation providing the deformation is beyond the elastic limit of the ringifit). Thus it is possible to achieve within nominal manufacturing tolerances a substantially consistent normal force between the ring 136 and opening 132 and consequently a substantially constant resistance force to movement of piston 94 on its adjusting movement. This is significant achievement because where the same effect to be obtained by carefully making parts to achieve in interference fit within elastic limits of the parts the manufacturing tolerances would be at least 10 times as great adding considerably to the cost of manufacture.

It is alsonecessary to provide that the ring 139 be ductile so as not to fracture while undergoing its deformation. 'One material suitable for the describedfnnction of ring 139 is low carbon steel having less than 0.106% carbon. The normal force between the ring13i and opening 132 is greater than the force of either of springs 124 and 138. There is about twenty thousandths clearance between ring 139 and a second sleeve 134 which has a fiange 136 and spring 138 compressed between the flange 136 and the ring 130. Pedal travel is not lost by road jars because, assuming that road shock has caused the rotor 22 to move toward the right beyond. the running clearance between the rotor surface 22 and friction pad 69, the friction pad 60 will be displaced toward the right pushing the piston 94 also toward the right and with-it the ring 130 which displaces the sleeve 122 toward the right against theresistance of spring 124; thus, when the rotor 29 is restored to its original position the spring 124 will bias the sleeve 122, ring 130, and piston 94 toward the left and returning the friction pad 60 therewith so that the original running clearance between the pad 60 and rotor surface 22 is not lost. Assuming that road shock caused rotor deflection to the left beyond the running clearance between friction pad 54 and surface 24 of the rotor, the friction pad 54 is displaced toward the left moving the cage therewith including the housing 56 and compressing the spring 124 against the axially fixed flange 126, the flange 126 being held by the stem 116. In this case, when the rotor returns to its normal position, the spring 124 acting through the cage, causes the friction pad 54 to move toward the right and follow-up rotor movement so that the running clearance between pad 54 and side 24 of the rotor is not lost.

' The device 194 also acts as an automatic adjuster during actuation of the brake and is operative by movement of the piston 94 leftwardly in FIGURE 3. Should applying movement of the piston 94 exceed the running clearance between the ring 13% and adjacent end of the sleeve 134, the actuating force will overcome the 50 pounds resistance to sliding movement between the ring 139 and opening 132 and the piston 94 will move left wardly (FIGURE 3) relatively to the ring 130 which has compressed the spring 138 in moving through its limited motion clearance with the end of sleeve 134. When the brake applying force on the piston 94 is relieved the spring 138 forces the ring 130 toward the right and the M ring carries the piston 94 therewith until the ring 130 is" moved through .030 inch and into engagement with the flange 126 of sleeve 122. The device 104 thus functions both to adjust the two friction pads and also to prevent loss of their proper running clearance because of road shocks which temporarily displace the rotor to the right or to the left.

Brake Operation In operation, fluid pressure which isdeveloped by the operator through a pedal or the like is communicated to the piston 94 which is biased leftwardly (FIGURE 3) pressing the friction pad 66 against surface 22 of the rotor, the friction pad moving slidably on its lugs 84 and as which are mounted in slots 62 and 64. Hydraulic reaction force urges the housing 56 toward the right thus displacing the cage (two sides of which are the yokes 5i) and 52) toward the right and thereby pressing friction pad 54 against surface 24 of the rotor; The described rightward movement of the cage in FIGURE 3 is obtained by virtue of the slidable connections formed between lugs 38, 4G and lugs 42, 44 in the torque resisting member 28 and their companion notches 62, 64, 66 and 68 in yokes 5t) and 52.

The braking force from engagement of the friction pads 54 and 60 with the rotor is transmitted to the two yokes 5i) and 52, the friction pad 54 transmitting its tangential anchoring load to the yokes through bolted connections 76 and 78 and the friction pad 60 transmitting its tangential braking load through flanges 88 and and the braking force is then transmitted through the yokes to one or the other of the convexly curved anchoring surfaces 46 or 48 of the torque resisting'member 28 (FIG URE 5) in the center plane of the rotor 20; Although the cage is a rigid structure, it is free to tilt angularly in a plane which is normal to the braking surfaces 22 and a l Z3 ment is also permitted because the surface of the yokes which engages rounded anchoring surfaces on the flange 34 enables the friction pads to adjust themselves to any irregularity in the opposing surfaces in the rotor. In this manner evenness of wear of the friction pads is ensured and the braking work is distributed in the same proportion between the respective friction pads. Because the point at which the anchoring thrust is transferred from the yoke members to the fixed structure 28 is located coplanar with the rotor (FIGURE the anchoring load does not impose any twisting force on the cage tending to apply either friction pad by an unequal amount. In other words, the friction pads are free to adjust themselves angularly to obtain full conformity with the opposing rotor surface and the anchoring load will not itself contribute to positioning of the cage and interfere with its proper angular location.

When the brake is released, the spring 138 acting through the ring 139 urges piston 94 toward the right and, acting through the stem 11% urges housing 58 and remaining portion of the cage toward the left thus relieving the applying force on the friction pads and permitting their retraction by the desired amount.

Referring next to the rear wheel brake embodiment which is shown in FIGURES 8-12, the rear Wheel brake includes a mechanical actuator designated generally by reference numeral 150 for applying the friction pad which is in addition to the hydraulic actuator. In this embodiment, the structure is essentially the same as described in the previous embodiment except that the yoke 152 and housing 154 are enlarged to accommodate the mechanical actuator which comprises two sets of levers 156 and 158. The lever set 156 (FIGURES l0 and 11) is mounted for turning movement on bracket 160 through pin 162, and the bracket is fastened to the mounting structure 28 by means of a screw 164 and bolt 166.

The lever set 156 has rounded convexly shaped thrust surfaces 168 in engagement with shoulder 170 of the thrust pin 172 which pass through opening 174 in the mounting structure 28 (FIGURE 9) and bears at its end 176 against the friction pad 60.

The two sets of levers 156 and 158 have an articulated linkage connection 180 through which force is transmitted between the two levers and the lever set 158 fulcrums on rounded convexly shaped surfaces 182 which bear against head 184 of adjuster screw 186. The adjusting screw is mounted threadedly in boss 191) of housing 154 and is locked in place by a set screw 192 (FIGURE 11). The threaded stem 186 has a slot 191 by which it can be turned for adjustment of the mechanical actuator and thereafter set screw 192 is turned to lock the screw 186 at its appropriate position. Adjustment of the mechanical actuator 15-1 compensates for wear of the friction pads and prevents excessive applying movement of the actuator when the wear pad clearance is excessive.

To apply the brake mechanically, pulling force is exerted through cable 196 and clevis 198 to lever set 158 which pivots on articulated connection 180 and communicates thrust through its rounded surfaces 182 to the stem 186 (FIGURE and housing 154 whereby the cage is drawn toward the right (FIGURE 9) pressing friction pad 54 against surface 24 of the rotor 20. When further movement of the cage toward the right is prevented by engagement of the friction pad 54 with surface 24, the lever set 158 fulcrums on its convexly shaped surfaces 184 and acting through articulated connection 180, causes the lever set 156 to pivot on its pin connection 162 with bracket 169 so that lever set 156 acts through its convexly shaped surfaces 168 to effect leftward applying movement of the thrust rod 172 (FIGURE 9) thereby applying friction pad 66. The applying forces on the friction pad 54 and 64) are approximately the same to obtain maximum braking efficiency. The mechanical actuator 159 in no way impedes the eficiency of the hy- 6 draulic actuator which functions identically with the previous embodiment and the hydraulic actuator in turn has no effect whatever on the mechanical actuator, each actuating means being independently operable to apply the friction pads 54 and 68 against the rotor.

In some instances we have found it advisable to insert a leaf spring 298 between one of the yoke members and the mounting member (FIGURES 1, 2, 5 and 8) to minimize brake noise. It has been found that the leaf spring 28 3 of this sort tends to cushion takeup in the brake parts which occurs during brake application and also tends to cushion vibrations which give rise to brake noises that are of various sorts such as are commonly found in all brakes.

Although the present invention has been illustrated in connection with a single example embodiment, it will be understood that this example is in no way restrictive of the invention. It is reasonable to be expected that those skilled in the art can make numerous revisions and adaptations of the invention that suit individual design preferences. It is intended that such revisions and adaptations as incorporate the herein disclosed principles will be included within the scope of the following claims as equivalents of the invention.

What is claimed is:

1. A brake comprising a rotor having flat annular braking surfaces at its opposite sides, a support plate having mounting means disposed adjacent the center of rotation of said rotor and extending alongside one of said braking surfaces and terminating in a transverse portion located beyond the outer periphery of said rotor, two rounded anchoring surfaces on said transverse portion one at each end thereof and each located substantially transverse to the plane of said rotor, two spaced braces fitted over said rotor which rotates therethrough and having slots which receive companion projections of said support plate providing sliding support of said braces and limited tilting movement therebetween at the rounded anchoring surfaces of engagement between said braces and transverse portion of said support plate, a friction member fixedly secured at its opposite ends to the brace ends at one side of said rotor, a second friction member at the other side of said rotor having slidable anchoring abutment surfaces with said spaced braces providing tilting movement effecting conformable contact between the rotor surface and friction member, the anchoring forces of both said friction members being transmitted through said braces to the rounded anchoring surfaces between said support member and braces, and actuator means at the side of said brake having the slidable friction memher and including a fluid motor housing disposed between and secured to said braces and a pressure responsive piston extending through an opening in said support and bearing against the slidable friction member to effect its application and exerting a reaction force through said braces to effect application of the friction member fixedly secured to said braces.

2. A brake comprising a rotor having annular braking surfaces at opposite sides thereof, a combination support and torque-taking member having a portion thereof adapted for mounting said member against rotation, said support member being located alongside one of said braking surfaces in spaced relation therewith and terminating in a transverse flange disposed beyond the outer periphery of said rotor, said flange having convexly curved anchoring surfaces substantially transverse to the plane of said rotor, spaced means at each of the sides of said support member encompassing the outer periphery of said rotor and including flat engagement surfaces one on each side of said rotor surface and spaced apart by an amount providing rotation of the rotor therebetween, a plurality of support connections between said means and support member providing lateral movement of said means to ward and away from the rotor braking surfaces and angular movement in a plane perpendicular to the planes of said braking surfaces and constraining circumferential movement of said means by engagement thereof with said support member at said convexly curved anchoring surfaces, a first friction member fixedly secured to said means at one'side of said rotor and movable laterally by said means into engagement with the contiguous braking surface, a second friction member at the other side of said rotor having slidable support connections with said means providing lateral movement toward and away from engagement with its contiguous rotor surface and resisting circumferential movement thereof, and a fluid motor actuator including a piston which biases said second friction member laterally against said rotor and a fluid housing connected to said means to communicate reaction force thereto effecting its lateral movement biasing said first friction member into engagement with said rotor.

3. A brake comprising a rotor having annular braking surfaces at opposite sides thereof, a combination support and torque-taking member having a mounting portion for holding said member against rotation and a flanged portion providing two spaced apart convexly curved anchoring surfaces, two spaced apart mounting members secured to said torque-taking member, said two mounting members each having spaced apart legs with a connecting portion in engagement with a respective one of said anchoring surfaces, a friction member havingmeans for fastening it between two of the legs of said mounting member and thereby clamping said mounting members together, a fluidmotor housing having vmeans for fasteningl ittbetween the other two legs of said mounting member for effecting a rigid rectangular cross section structure including said friction member, housing and mounting members, means for supporting said mounting members on said torque-taking member for .slidable' movement thereon and providing limited pivotal movement between said anchoring surfaces and said mounting members, a second friction member slidably mounted on' said mounting members and movable relative thereto and a fluid pressure responsive means slidably received in said housing and operatively connected to said slidable friction member for transmitting applying effort to said slidable friction member and communicating reaction force to said first friction member through said housing and mounting members.

4; A brake comprising a support member, two circumferentially spaced yoke members having axially spaced legs with axial spacings therebetween providing turning movement of a rotatable member therebetween, friction means rigidly coupling two of the legs of said yoke members at one side of said axial spacings, a housing rigidly coupling the other two legs at the opposite side of said axial spacing, means forming mounting surfaces between said yoke members and support member and'providing both axial sliding movement thereon and limited pivotal movement in an axial plane, means forming anchoring abutment surfaces between said yoke members and support member to receive anchoring force therebetween, a second friction means mounted for axial sliding movement at the opposite ends thereof on the legs of said yoke memberscoupled by said housing and communicating its anchoring force to said yoke members, and a fluid pressure responsive means received in said housing and effect- 7 ing axial applying force on said slidable friction means and communicating reaction force through said housing and yoke members to said friction means coupled therewith to be axially applied by slidable movement between said yoke member and support member, a first lever fulcrumed for pivotal movement in an axial plane by operative connection with said housing and yoke members, a

second leverpivotally connected to said housing and pro- 5;; tion member and friction member coupled to said yoke member are applied by turning of said first lever.

5. A brake comprising a rotor having a pair of braking surfaces thereon, a fixed support member, a housing having a fluid motor actuator therein including a piston, means forming a mounting connection between said housing and support member and providing floatable movement of said housing in an axial direction relatively to said support member, said housing comprising a pair of angularly spaced yoke members which embrace said rotor, two angularly spaced anchoring rabutments on said support member disposed substantially transverse to the plane of said braking surfaces of said rotor and disposed radially beyond the outer periphery of said rotor for engagement by said yoke members, a pair of fiiction municating its anchoring force to said yoke members,

said housing being pivotally movable on said anchoring abutments to provide conformable contact between said friction members and the opposite surfaces of saiddisk;

6. In a disc brake: a rotor having friction faces thereon, a fixed support member, a housing member straddling said rotor and mounted on said support member for movement in a direction transverse to said rotor friction faces, actuating means mounted on said housing member, a pair of circumferentially spaced anchoring surfaces located on said housing member, a pair of circumferen tially spaced anchoring surfaces located on said support member facing and abutting a respective one of said .housing anchoring surfaces, said anchoring surfaces on one of said members being convexly shaped and said anchoring surfaces on the other of said members being substantially fiat, said conyexly shaped anchoring surfaces 7 being curved in a plane transverse to said rotor friction surfaces and said flat surfaces lying in a plane generally perpendicular to said transverse plane, whereby said housing member will move in a direction transverse to said 7 rotor friction faces and rock in a plane generally perpendicular to said rotor friction faces upon brake application.

7. The/structure as recited in claim 6 wherein said housing comprises a pair of circumferentially spaced'yoke members, said yoke members straddling said rotor and having portions thereof extending along opposite sides of and spaced from said rotor friction faces, said yoke members being in planes transverse to the plane of said rotor friction faces, said housing anchoring surfaces being located on each of said yoke members.

8. The structure as recited in claim 7 wherein said fixed support member extends opposite one of said rotor friction faces and terminates in a transverse portion located beyond the outer periphery of said rotor, said support member anchoring surfaces being located on said transverse portion of said support member. a

9. The structure as recited in claim 8 wherein said convexly shaped anchoring surfaces are on said support member.

10. In a discbrake: a rotor having friction faces thereon, a fixed support member, a housing member straddling said rotor and mounted on said support member for movementin a direction transverse to said rotor friction faces, actuating means mounted on said housing member, a pair of circumferentially spaced anchoring surfaces located on said housing member encompassing a portion of said support member, a pair of circumferentially spaced anchoring surfaces located on said support member portion facing and abutting a respective one of said housing member surfaces, said anchoring surfaces on one of said members being convexly shaped and said anchoring surfaces on the other of said members being substantially flat, said convexly shaped anchoring surfaces being curved in a plane transverse to said rotor friction faces and the said fiat surfaces lying in a plane generally perpendicular to said transverse plane, whereby said housing member will move in a direction transverse to said rotor friction faces and rock in a plane generally perpendicular to said rotor friction faces upon brake actuation.

11. The structure as recited in claim 10 wherein said housing comprises a pair of circumferentially spaced yoke members, said yoke members straddling said disc and having portions thereof extending on opposite sides of and spaced from said rotor friction faces, said portion of said support member be ng located between said yoke members, said housing member anchoring surfaces being located on said yoke members.

12. The structure as recited in claim 11 wherein said fixed support member extends opposite one of said rotor friction faces and terminates in a transverse portion located beyond the outer periphery of said rotor, said support member anchoring surfaces being located on said transverse portion of said support member.

13. The structure as recited in claim 12 wherein said convexly shaped anchoring surfaces are on said support member.

References Cited in the file of this patent UNITED STATES PATENTS 2,820,530 Chouings et a1 Jan. 21, 1958 2,902,120 Nahodil Sept. 1, 1959 2,949,173 Peras Aug. 16, 1960 2,966,964 Brueder Ian. 3, 1961 FOREIGN PATENTS 1,180,633 France Ian. 5, 1959 (Corresponding U.S.-3,035,664, May 22, 1962) 

1. A BRAKE COMPRISING A ROTOR HAVING FLAT ANNULAR BRAKING SURFACES AT ITS OPPOSITE SIDES, A SUPPORT PLATE HAVING MOUNTING MEANS DISPOSED ADJACENT THE CENTER OF ROTATION OF SAID ROTOR AND EXTENDING ALONGSIDE ONE OF SAID BRAKING SURFACES AND TERMINATING IN A TRANSVERSE PORTION LOCATED BEYOND THE OUTER PERIPHERY OF SAID ROTOR, TWO ROUNDED ANCHORING SURFACES ON SAID TRANSVERSE PORTION ONE AT EACH END THEREOF AND EACH LOCATED SUBSTANTIALLY TRANSVERSE TO THE PLANE OF SAID ROTOR, TWO SPACED BRACES FITTED OVER SAID ROTOR WHICH ROTATES THERETHROUGH AND HAVING SLOTS WHICH RECEIVE COMPANION PROJECTIONS OF SAID SUPPORT PLATE PROVIDING SLIDING SUPPORT OF SAID BRACES AND LIMITED TILTING MOVEMENT THEREBETWEEN AT THE ROUNDED ANCHORING SURFACES OF ENGAGEMENT BETWEEN SAID BRACES AND TRANSVERSE PORTION OF SAID SUPPORT PLATE, A FRICTION MEMBER FIXEDLY SECURED AT ITS OPPOSITE ENDS TO THE BRACES AND TRANSVERSE PORTION OF SAID SUPPORT PLATE, A FRICTION MEMBER FIXEDLY SECURED AT ITS OPPOSITE ENDS TO THE BRACES ENDS AT ONE SIDE OF SAID ROTOR, A SECOND FRICTION MEMBER AT THE OTHER SIDE OF SAID ROTOR HAVING SLIDABLE ANCHORING ABUTMENT SURFACE WITH SAID SPACED BRACES PROVIDING TILTING MOVEMENT EFFECTING CONFORMABLE CONTACT BETWEEN THE ROTOR SURFACE AND FRICTION MEMBER, THE ANCHORING FORCES OF BOTH SAID FRICTION MEMBERS BEING TRANSMITTED THROUGH SAID BRACES TO THE ROUNDED ANCHORING SURFACES BETWEEN SAID SUPPORT MEMBER AND BRACES, AND ACTUATOR MEANS AT THE SIDE OF SAID BRAKE HAVING THE SLIDABLE FRICTION MEMBER AND INCLUDING A FLUID MOTOR HOUSING DISPOSED BETWEEN AND SECURED TO SAID BRACES AND A PRESSURE RESPONSIVE PISTON EXTENDING THROUGH AN OPENING IN SAID SUPPORT AND BEARING AGAINST THE SLIDABLE FRICTION MEMBER TO EFFECT ITS APPLICATION AND EXERTING A REACTION FORCE THROUGH SAID BRACES TO EFFECT APPLICATION OF THE FRICTION MEMBER FIXEDLY SECURED TO SAID BRACES. 